Create README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

helper/argh/README.md

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+# Argh
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## The goal
+
+Argh helps to handle command line arguments in a big way. Don't use the build-in Python stuff for that.   
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+```shell
+pip install argh
+```
+
+## Simple example
+
+### No argument is required​
+
+The arguments are now only optional for the function call:
+
+```python
+import argh
+
+
+def main(first_parameter: int = 1, second_parameter: int = 2, third_parameter: bool = True) -> None:
+    print("Main")
+
+
+if __name__ == "__main__":
+    argh.dispatch_command(main)
+```
+
+```shell
+python test.py
+```
+
+Output
+
+```shell
+Main
+```
+
+```shell
+python test.py --help
+```
+
+Output
+
+```shell
+usage: test.py [-h] [-f FIRST_PARAMETER] [-s SECOND_PARAMETER] [-t]
+
+options:
+  -h, --help            show this help message and exit
+  -f FIRST_PARAMETER, --first-parameter FIRST_PARAMETER
+                        1
+  -s SECOND_PARAMETER, --second-parameter SECOND_PARAMETER
+                        2
+  -t, --third-parameter
+                        True
+```
+
+Note: For boolean parameters using the option switches them to the other state. Here **python test.py** sets **third-parameter=True** and **python test.py -t** sets **third-parameter=False**.
+
+
+### One argument is required​
+
+```python
+import argh
+
+
+def main(first_parameter: int, second_parameter: int = 2, third_parameter: bool = True) -> None:
+    print("Main")
+
+
+if __name__ == "__main__":
+    argh.dispatch_command(main)
+```
+
+```shell
+python test.py
+```
+
+Output
+
+```shell
+usage: test.py [-h] [-s SECOND_PARAMETER] [-t] first-parameter
+test.py: error: the following arguments are required: first-parameter
+```
+
+```shell
+python test.py 1
+```
+
+Output
+
+```shell
+Main
+```
+
+## More than one function​
+
+Sometimes we have a collection of function. This is how we select one of those:
+
+```python
+import argh
+
+
+def main_1(
+    first_parameter: int = 1, second_parameter: int = 2, third_parameter: bool = True
+) -> None:
+    print("Main 1")
+
+
+def main_2(first_parameter: int = 1) -> None:
+    print("Main 2")
+
+
+if __name__ == "__main__":
+    parser = argh.ArghParser()
+    parser.add_commands([main_1, main_2])
+    parser.dispatch()
+```
+
+```shell
+python test.py
+```
+
+Output
+
+```shell
+usage: test.py [-h] {main-1,main-2} ...
+```
+
+```shell
+python test.py main-1
+python test.py main-2
+```
+
+Output:
+
+```shell
+Main 1
+Main 2
+```
+
+```shell
+python test.py main-1 --help
+python test.py main-2 --help
+```
+
+Output: 
+
+```shell
+usage: test.py main-1 [-h] [-f FIRST_PARAMETER] [-s SECOND_PARAMETER] [-t]
+
+options:
+  -h, --help            show this help message and exit
+  -f FIRST_PARAMETER, --first-parameter FIRST_PARAMETER
+                        1
+  -s SECOND_PARAMETER, --second-parameter SECOND_PARAMETER
+                        2
+  -t, --third-parameter
+                        True
+
+usage: test.py main-2 [-h] [-f FIRST_PARAMETER]
+
+options:
+  -h, --help            show this help message and exit
+  -f FIRST_PARAMETER, --first-parameter FIRST_PARAMETER
+                        1
+```
+
+
+
+
+